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This paper presents a theoretical analysis of various combined power and refrigeration cycles (CPRCs) as well as the working fluid selection used in these cycles based on the first law of thermodynamics. These proposed cycles include a combination of organic Rankine cycles (ORCs) and an ejector refrigeration cycle (ERC) to produce more power and refrigeration, simultaneously. In all the proposed cycles,...
Anti-wear additives are important components of the lubricating oils which protect the sliding surfaces from wear. Researches on developing the non-phosphorus catalysis-friendly anti-wear additive still continue due to government’s regulations. One way to provide non-phosphorus anti-wear additive is boron and sulfur addition to succinimides. In this study, boron succinimide used as an anti-wear additive...
This paper focuses on the damped and undamped transient response of in-plane and out-of-plane loaded stepped curved rods. A unified approach combining the complementary functions method with the Laplace transform is applied to examine the dynamic behavior of above structural elements, while the materials are assumed to be isotropic and homogeneous. The effect of shear deformation is also taken into...
An approximate solution of two-body problem is proposed using weighted combination of linear and inversely cubic gravity models. First, two approximations are introduced for the weight coefficients. To enhance the accuracy of the solution, a modified weight coefficient is suggested by a linear combination of the two primary weight coefficients. The accuracy and computational burden of the combined...
The multidisciplinary design optimization (MDO) is an important concept that focuses on bringing together disciplines involved with machine design. It is possible to use MDO in any stage of an aircraft design, that is in the conceptual, preliminary, or detailed design, as long as the numerical models are fitted to each of these stages. This work describes the development of a multidisciplinary design...
In this numerical investigation, the nonlinear structural response of an electrostatic carbon nanotube (CNT) based nano-actuator assuming a non-parallel (out-of-plane) plates actuation configuration is examined. The actuating force is initiated by the asymmetry of the resultant electric fringing-fields caused mainly due to the non-parallel electrodes scheme. The nano-actuator is designed based on...
This research involves the numerical study of the conjugate natural convection of a power-law fluid in a two-dimensional square cavity with a pair of conducting baffles. The lower wall of the cavity contains a heat source with constant heat flux, while a pair of conductive baffles is embedded on its upper wall. The left and right side walls and some parts of the lower wall of the cavity are thermally...
In 1866 Maxwell published the Dynamical Theory of Gases with a new and revolutionary model for the intermolecular forces, from which the changes of the various functions of the velocities caused by collisions with molecules were found based on the fifth power of distance law. From a general equation of transfer for a moving gas element developed by Maxwell, the Navier–Stokes equation was written by...
This study analyzes a nonlinear system with a crank–shaft–slider mechanism linked to a pendulum. The crank is powered by a DC motor that moves horizontally the pendulum pivot. The speed of the motor is influenced by the pendulum dynamics, reason for calling the system as nonideal. In literature, the vibration of the pendulum support by a crank–shaft–slider is generally considered as harmonic what...
In this work, an experimental study has been carried out to evaluate the effect of salt water condition on the long-term adhesion of composite-to-metal bonded joints using peel tests. A new test configuration is tested via fully and partially immersed specimens with 500 mm length. Fracture surfaces of non-aged samples exhibited a cohesive failure within the adhesive layer, which indicates a good adhesion...
Recognizing the significance of accurate predictions of flow conditions in open-channel bends is key in attempts to preserve riverbanks from erosion. The focus of the present work is on the application of two computational intelligence (CI) models to predict free surface flow pattern in a strongly curved 60° open-channel bend. An experimental study is also carried out to prepare the required input...
Computational aeroacoustics simulations require a considerable amount of time, which makes the comparison of a large number of different geometric designs a difficult task. The goal of the present study were to provide a suitable methodology for aeroacoustic optimization. By means of numerical analyses using commercial computational fluid dynamics tools (Ansys Fluent), the application of a detached...
A novel optimal fuzzy integrated control method is proposed and used to a half-car model with active suspension system. The cultural algorithm improved by the use of a dynamic acceptance function associated with niche algorithm is presented to optimize the fuzzy control rules with 4 input variables and 2 output variables. The vertical and rolling vibration accelerations of the bodywork are selected...
A welding robotization has been used to improve the weld quality, minimize the process of trial and error, ensure process repeatability, and above all avoid the requirement for a highly qualified professional. The objective of this work is to verify the possibility of welding robot be programmed by the desired characteristics of the weld bead and in the case of use stainless steel also by the amount...
This article presents a novel rotary magnetorheological fluid device with inherently low off-state torque. The working principle of the device is similar to peristaltic pumps except the fluid remains inside the device and circulates continuously. Unlike other continuous rotation magnetorheological fluid devices, which operate in shear mode, the proposed device works in pressure driven flow mode. A...
Boundary Integral simulations are very common to study the microhydrodynamics of viscous drops and predict the rheology of emulsions. The standard boundary integral formulation for the velocity field at the drop surface is given by surface integrals of singular Green’s functions in space and depends on geometric quantities of the mesh, as the local mean curvature and the unitary exterior normal vector...
Water hydraulic directional valve is a key control element in seawater fluid power system. Because of the properties of high bulk modulus and low viscosity of seawater, the leakage and dynamic characteristics of directional valve would be different from those of the traditional one. In this study, a new working principle of seawater hydraulic 4–3 cartridge directional valve (abbr. SHCDV) is introduced,...
This paper presents a modified butterfly optimization algorithm (MBOA) for solving mechanical design optimization problems. The modification is focused on an additional intensive exploitation phase which provides more chance to solutions to improve itself. The performance of the proposed algorithm is validated on fifteen benchmark test functions and three engineering design problems which have different...
This paper mainly focuses on parametric optimization of squeeze cast hybrid (LM24–SiCp–coconut shell ash) composite through Taguchi method and genetic algorithm. The composite samples have been cast through squeeze casting for each experimental trial based on L9(3)4 orthogonal array. From analysis of variance, it has been found that reinforcement and squeeze pressure were the casting parameters making...
In this paper, the dynamic Green’s functions are used to calculate the dynamic responses of Levy-type plates with different boundary conditions under an arbitrary, linear-trajectory, moving load. The plate’s response is composed of two parts, i.e., the particular solution for the moving load and the homogeneous solution. Utilizing the superposition principle, the particular solution is expressed in...
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